[Muzz]

Keeping it brief... I'm trying to validate my CFD model, and its performance over a range of advance ratios, with experimental results. Essentially, it's the same setup as the prop in open water tutorial, from the Star-CCM+ documentation, except I'm using air as my medium. I pretty much followed the same procedure, yet I can't get the results I want. I've tried everything I, and the cd-adapco support staff, can think of. The only thing I can think is that it must be is the prism layer mesh on the blade surface and/or the y+ values that result. However, I've tried increasing/decreasing the number of prism layers and using different near wall models but convergence still eludes me...

I've attached the prism layer mesh surrounding a blade section, as well as the residuals and performance curves of CFD vs. experimental. Any suggestions?

[Gary6891]

Have you tried mesh refining and smoother transition between prism and core cells? Are you able to mimic experimental conditions, size of the simulation domain, boundary conditions at inlet including turbulent parameters? Is the flow turbulent in experiments, does decreasing y+ change results or iterating more than 500 iterations per point? Is sliding mesh approach possible?